Development of Lens Concentration Systems with Secondary Optical Elements

In the work, results of comparative investigation of the optical efficiency and power characteristics of concentrating systems with primary Fresnel lenses and secondary optical elements (SOE) are presented. The following types of the secondary optics are under consideration: an open truncated tetrahedral equilateral pyramid with specular walls and a kaleidoscope with a flat or convex top surface, which ensure achieving the high optical efficiency of a two‐element optical system, lowering its sensitivity to the Sun tracking inaccuracy and increasing uniformity of concentrated radiation distribution on a solar cell. As a result of the investigations carried out, the optimum parameters of the secondary optics have been determined, and the best optimal versions are recommended for practical usage in concentrator modules.